Tire gauge



T. F. KEARNEY TIRE `GAUGE'.

Filed Nov. 2, 1926 Aug. 21, 1928.

Inventar ttorney Patented Aug. 21, 1928.

,l @TIRE Grauen@v y This'invention relatesto an improved air pressurejgauge vy'vhieh is especially but, not necessarily, adapted for use in connection with automobile tire valves.

The invention has more particular'reference to a structure of this kind which is con-y structed to permit it to be connected with the valve or directly with the inner tubev in order that it may take the place of the valve. y

Briefly, the invention has reference to a cylinder having a tube extending through and beyond the opposite ends thereof, there being a valve at one end of the tube, means for connecting the valved end to said inner tube, and a closing cap at the opposite end, together with a spring pressed piston in the cylinder carrying an indicator for cooperation with graduations on' the exterior of the cylinder for indicating the pressure in said inner tube.

The invention is characterized by simplicity of construction, compactness and convenience or' arrangement of parts, and etticiency in construction and use.

Other features and advantages of the invention will become apparent from the following description and drawings. K

In the accompanying drawings forming a part oli this application and in which like numerals are employed to designate like parts throughout the same f f I Figure 1 is a side elevation of a gauge constructed in accordance with the invention,

Fig. 2 is a. longitudinal sectional View thru the same.

Referring to the drawings in detail, it will be seen that the cylinder comprises an open ended cylindrical shell v1 having a removable cover plate 2 on one end and a removable cup 3 on its lower end. Formed in one side and between its 'ends is an elongated slot 4 having cooperating graduations formed on the edges thereof as shown in Fig. 1. y

The tube is represented bythe reference character 5 and this extends through and beyond the ends ot the cylinder, the extending portions being screw threaded and there being a nut 6 on one screw threaded portion, and a removable cap 7 on the other. The first named end portion is constructed as at 8 to form a housing for a flap valve 9 having an operating' stem 10.

A suitable fitting 11 is provided and is conffstructedfftorconnection tothe automobile `inner tube. lt willbe noticed 'that the'valve stem 10 extends through the upper end of the tube 5 and'engages the cap 7. y Obviously, when pressure is in the inner tube, it serves to holdthe valve 9 closed and the stem 10 engaged with thecap 7 .f However, by threading this sleeve carries an indicator 15 for cooperation with the aforesaid graduations. The stem of the indicator extends through the slot 16 in the piston and also through the slot l in the cylinder. A coiled spring 17 surrounds the tube 5, bears at one end against the upper end of the piston 12 and at its oppositeend against a shoulder 18 carried by the tube. The opposite end of the piston bears upon a nut 19 carried by the threaded lower end portion of the tube 5.

Just below thenut are air ports 20. In the form of the invention illustrated in the drawings, the construction is such'as to permit the device to be made a permanentpart lin ot the inner tube. However, it lnightyvellx.`

be made in the form ot' any attachment to go on the ordinary inflation valve. Assuming that the device isin place on the inner tube, it will be seen that by removing the cap 7, and replacing it with the usual hose inflation head, a quantity of air will bek supplied through the tube 5 in a mannerto open the valve 9 and inflate the inner tube.

The back pressure will build up in the c chamber formed in the lowerportion of the y cylinder by escaping through the portQO and will operate the piston 12 to inturn operate the indicator 15'to `show the approximate degree of pressure then, inthe tube. As soon as the valve stem valve 9 will close.

It is believed that by considering the de scription` in .connection with the drawings, a clear understanding of the inventionwill be had. Therefore, a more lengthy description is thought unnecessary.

10 is released the the upper end portionof the cylinder IZYis` preferably painted or otherwise coloredwith red, and windows 21 are provided on opposite sides of the slotst to eXpose this red band therethrough for the purpose of indieating when the Having thus described my invention whaty I claim as new is In a pressure gauge'a'fslotted cylinder, a i

spring pressed pistonslidably mounted in said cylinder,` an` adjustingr screw rcarried by ythe piston, L1-screw threaded sleeve carried 'carried by said sleeve and extending voutwardly through the lslot in said cylinder, yand an -indicatorf on the outer end of the stem.

In testimony whereof I aIiX mysignature. pressure inthe inner-tube is `vdangerously low. v

l' y THOMAS 1i KEAmmv. 

